KR20120134110A - Tool coupling - Google Patents

Abstract

In the tool coupling 20 in the form of a cutting tool used for internal machining operations, the second part 24 having a single cut is clamped to the first part 22 by means of a clamping screw 26. The second component 24 has a mounting surface having three male mating members 36 that mate with three female engagement members 32 on the mounting surface of the first component 22. Each of the three female engagement members 32 has two sets of sides located on a share, the shares exhibit mirror symmetry about a first plane, each of the two sets of sides being in the first plane. It has two opposing flank faces separated by. Only one of the two flank surfaces of each of the two set sides is in clamping contact with a corresponding proximal face in each of the three male engageable members.

Description

Tool Coupling {TOOL COUPLING}

BACKGROUND OF THE INVENTION The present invention generally relates to tool couplings for use in metal cutting processes, and more particularly to tool couplings for internal machining operations.

In the field of metal cutting tools, which include a cutting head fixed to a tool holder by a clamping screw, in the form of a cutting insert in the form of a hard material, ie sintered carbide, the cutting head can be fixed in various ways Can be.

KR 20-2000-0020103 discloses an indexable boring tool with a cutting insert having a single cutting edge detachably fixed to a cylindrical holder using a screw. A pair of domed protrusions and a plurality of first serrations extending perpendicularly to the domed protrusions from the bottom surface of the cutting insert are located in the V groove and the plurality of second serrations, respectively, on the upper surface of the holder. . In order to prevent the rotation of the cutting insert during the cutting operation, the inclined surfaces on the plurality of first serrations correspondingly contact the inclined surfaces of the second serration, and help to prevent the rotation of the cutting insert and to the holder. The portion of the domed projection contacts the inclined surface of the V-groove in order to accurately position the cutting insert with respect to it.

US 7,150,590 discloses a milling tool having a cutting plate with four radially projecting cutting edges fixed to the front end of the milling shaft by fastening screws. Three radially extending ribs protruding from the end face of the cutting plate are mounted in three complementary grooves in the seat on the front end, each rib and each groove having two side flanks and Each of the two side flanks and the two side walls have different inclination angles in order to prepare for axial positioning and torque transfer between the cutting plate and the milling shaft.

It is an object of the present invention to provide an improved tool coupling.

Another object of the present invention is to provide an improved tool coupling that can be manufactured efficiently.

It is a further object of the present invention to provide an improved tool coupling with a mating member that can be manufactured in a simple milling operation.

A tool coupling according to the invention is provided, the tool coupling comprising a first part, a second part and a clamping member for clamping the first and second parts together,

The first part has a mounting surface provided with a longitudinal axis and at least three female engagement members,

The second part has a mounting surface having at least three male mating members that mate with the at least three female mating members,

Each of the at least three female engagement members has a first plane and at least two sets of sides, wherein the at least two sets of sides are located on at least a share of each of the female engagement members, and the sharing is each first plane Mirror symmetry,

Each of said at least two set sides has two opposing flank surfaces separated by said respective first planes,

Only one of the two flank surfaces of each of the at least two set sides is in clamping contact with a corresponding proximal face in each of the at least three male engageable members.

For a better understanding, the present invention will be described by way of example only with reference to the accompanying drawings, in which dashed lines are indicated by dashed lines for partial views of the members.
1 is a perspective view of a tool coupling in accordance with some embodiments of the present invention.
FIG. 2 is a first exploded perspective view of the tool coupling shown in FIG. 1. FIG.
3 is a second exploded perspective view of the tool coupling shown in FIG. 1.
4 is a front end view of the first part according to the first preferred embodiment of the present invention.
FIG. 5 is a cutaway view of the first part shown in FIG. 4 taken along the line VV.
6 is a rear end view of the second component according to the first preferred embodiment of the present invention.
7 is a side view of a tool coupling according to a first preferred embodiment of the present invention.
8 is a front end view of the first part according to the second preferred embodiment of the present invention.
FIG. 9 is a cutaway view of the first part shown in FIG. 8 taken along the line IX-IX. FIG.
10 is a rear end view of the second part according to the second preferred embodiment of the present invention.
11 is a side view of a tool coupling according to a second preferred embodiment of the present invention.

Referring first to FIGS. 1, 2, and 3, a tool coupling 20 is shown in accordance with some embodiments of the present invention. The tool coupling 20 is in the form of a cutting tool used for internal machining operations, the first component 22, the second component 24, and the first and second components 22, 24. A clamping member 26 for clamping together.

In some embodiments of the invention, the clamping member 26 may be in the form of a clamping screw 28.

In some embodiments of the invention, as shown in FIGS. 4-11, the first part 22 may have a mounting surface that may have exactly three female engagement members 32. 30, wherein the second component 24 may have three male engaging members 36 interfacing with the three female engagement members 32. (mounted surface) 34. In another embodiment of the invention (not shown), the first component has a mounting surface that may have more than three female engagement members, and the second component has three mating with more than three engagement members. It has a mounting surface that can have more engageable members. 4 to 11, the mounting surface 30 is a forward facing mounting surface, whereas the mounting surface 34 is a backward facing mounting surface.

The first component 22 may have a substantially cylindrical shape having a continuous peripheral surface 38 adjacent to the mounting surface 30 and a longitudinal axis A1 extending through the mounting surface 30, and the machine It can be manufactured from machined steel. The second component 24 may comprise a single cut 40 having a cutting edge 42 and an associated rake surface 44 and may contain carbide powder, such as tungsten carbide. It can be produced by pressing and sintering.

In another embodiment (not shown) of the present invention, the first part may be made of tungsten carbide and may include a cutting part, and the second part may be made of machined steel. In another embodiment (not shown) of the invention, the first part or the second part may comprise more cutting parts than a single cutting part.

In some embodiments, as shown in FIGS. 4, 5, 8, and 9, the mounting surface 30 of the first component 22 may be approximately planar and rotate about the longitudinal axis A1. Symmetrical, each of the three female engagement members 32 is identical and spaced at equal intervals in the circumferential direction about the longitudinal axis A1.

Each of the three female engagement members 32 may be approximately groove-shaped with a first plane P1 and exactly two sets of sides 46, 48. In another embodiment of the invention (not shown), each of the three female engagement members may have more than two sets of sides.

As shown in Figures 4, 5, 8, and 9, the two sets of sides 46, 48 are located in the share 58 of each female engagement member 32, and the share 58 It exhibits mirror symmetry about each first plane P1.

In some embodiments of the present invention, the two sets of sides 46, 48 may extend beyond the share 58.

Each of the two set sides 46, 48 has two opposing flank surfaces 50, 52; 54, 56 separated by respective first planes P1.

As shown in FIGS. 5 and 9, the first set of sides 46 includes first and second upper flank surfaces 50, 52 adjacent to the mounting surface 30, and the second set of sides ( 48 includes first and second lower flank surfaces 54, 56 spaced apart from the mounting surface 30.

The two flanks 50, 52; 54, 56 of the two sets of sides 46, 48 of each of the three female engagement members 32 may intersect the peripheral surface 38 and each share 58. May extend in a direction substantially parallel to the mounting surface 30 of the plane.

In a first preferred embodiment of the tool coupling 20, as shown in FIGS. 4 and 5, two flank surfaces 50, 52 of two sets of sides 46, 48 of each female member 32; 54 and 56 show mirror symmetry about each first plane P1.

In some embodiments of the present invention, each of the flanks 50, 52; 54, 56 may have a shallow convex shape, and in other embodiments (not shown), each of the flank faces may be approximately planar. have.

In some embodiments, as shown in FIGS. 5 and 9, the first plane P1 of the three female engagement members 32 is two sides of two sets of sides 46, 48 of each female engagement member 32. On a substantially planar mounting surface 30 that allows the milling tool (not shown) to rotate about an axis of rotation perpendicular to the mounting surface 30 to simultaneously form flank surfaces 50, 52; 54, 56. May be perpendicular to each other.

The two flanks 50, 52; 54, 56 of the two sets of sides 46, 48 of the three female engagement members 32 are mirror points symmetric about their respective first planes P1. , S2; S3, S4). Reference lines L1 and L2 perpendicular to the mirror symmetrical surface points S1 and S2 of the first and second upper flank surfaces 50 and 52, respectively, on the first set side 46 are respectively defined. The first plane P1 and the first engagement angle α1 may be formed respectively, and the mirror symmetric surface points S3 of the first and second lower flank surfaces 54 and 56 at the second set side surface 48, respectively. , Reference lines L3 and L4 perpendicular to S4 may form respective first planes P1 and second engagement angles α2, respectively, and the first and second engagement angles α1 and α2 may be different.

In some embodiments, the first engagement angle α1 may be greater than the second engagement angle α2.

In some embodiments, as shown in FIGS. 1, 2, 3, 6, and 10, the second part 24 has a diameter similar to or the same as that of the first part 22 and of the approximately planar shape. It may have a cylindrical shape with an end face 60 facing the mounting surface 34 and a continuous outer surface 62 extending between the mounting surface 34 and the end surface 60.

In some embodiments, as shown in FIGS. 6, 7, 10, and 11, the three male engageable members 36 on the mounted surface 34 are approximately ribs with two adjacent surfaces 64, 66. And a first adjacent surface 64 corresponds to a first upper flank surface 50 of each of the three female engagement members 32, and a second adjacent surface 66 corresponds to the three female engagement members. (32) corresponds to each second lower flank surface 56. The first upper flank surface 50 and the second lower flank surface 56 of each of the three female engagement members 32 are separated by respective first planes P1.

In some embodiments of the invention, the first and second proximal surfaces 64, 66 may be generally planar, corresponding respectively with shallow convex first and second lower flank surfaces 50, 56, In other embodiments (not shown), the first and second adjacent surfaces may be shallow convex shapes corresponding respectively to the first upper and second lower flank surfaces of the substantially planar surface.

In order to assemble the first and second parts 22, 24, the mounting surface 34 is mounted on the mounting surface before the three male mating members 36 are positioned in the three female mating members 32. It is located opposite the 30.

In some embodiments, each of the three female engagement members 32 is identical and spaced apart at equal intervals in the circumferential direction about the longitudinal axis A1, and the three male engageable members 36 are It may be located within the three female engagement members 32 at three different circumferential positions. In connection with this type of embodiment and with the second component 24 having a single cut 40, the first component 22 may include a locating feature (not shown). And a single cut 40 may be properly aligned by the positioning feature.

The clamping screw 28 passes through a through bore 68 extending between the end surface 60 and the mounting surface 34 before being screwed into the threaded bore 70 on the mounting surface 30. . Then, the three first adjacent surfaces 64 are in clamping contact with the three first upper flank surfaces 50 and the three second adjacent surfaces 66 are three second lower flank surfaces 56. The clamping screw 28 is suitably fastened to make a clamping contact with it.

In some embodiments, the threaded bore 70 may be coaxial with the longitudinal axis A1 and the threaded bore 70 may also be coaxial with the through bore 68.

After assembling the first and second components 22 and 24, an axial gap G1 remains between the approximately planar mounting surface 34 and the approximately planar mounting surface 30, and the third Three first upper flank surfaces 50 in clamping contact with the two first adjacent surfaces 64 and three second lower flank surfaces 56 in clamping contact with the three second adjacent surfaces 66. Except there is no contact between the first component 22 and the second component 24.

In a first preferred embodiment of the tool coupling 20, as shown in FIGS. 4 to 7, the first plane P1 of the three female engagement members 32 is radially oriented so that it is longitudinally oriented. (A1), and the mounting surface 30 may exhibit mirror symmetry about each first plane P1. The first preferred embodiment of the tool coupling 20 provides great flexibility in configuration, and the same first part 22 has a single right cut 40 as shown in FIGS. 6 and 7. The same clamping performance is provided for both parts of the equivalent second part with the second part 24 and the left cutout (not shown).

The adjacent arrangement shown in FIG. 7 is repeated at the interface between the mated pairs of each male and female member. Generally speaking, only one of the first and second upper flank surfaces 50, 52 of each female engagement member 32 is engaged by the first proximal surface 64 of the corresponding male engagement member 36. Only one of the first and second lower flank surfaces 54, 56 of each female engagement member 32 is engaged by a second adjacent surface 66 of the corresponding male engagement member 36. Furthermore, the mated upper flanks are all on one side of each first plane P1 of the corresponding female mating member 32, and the mated lower flanks are of the corresponding female mating members 32. All are on the other side of each first plane P1.

In some embodiments, the clamping contact with each of the first upper and second lower flank surfaces 50, 56 in each of the three female engagement members 32 is two contact regions 72 adjacent the peripheral surface 38. 74, first and second adjacent surfaces 64, 66 of each of the three male engageable members 36 intersect the outer surface 62 and slightly diverge in a direction away from the outer surface 62.

In a first preferred embodiment of the tool coupling 20, as shown in FIG. 4, a second plane P2 perpendicular to the first plane P1 is defined by two of each female engagement member 32. Intersect with each contact zone 72, 74.

Maintaining torque between the first and second components 22, 24 and reacting against the tangential cutting force Ft induced through the first proximal surface 64 of the three male engageable members 36. To this end, the first upper flank surface 50 of the three female engagement members 32 may be formed as a drive surface forming an angle between the longitudinal axis A1 and an angle between 5 ° and 30 ° (see FIG. 7). ). The rake face 44 associated with the cutting edge 42 is directed in a first tangential direction D1 about a central axis A2 which is generally coaxial with the through bore 68. On the other hand, the first proximal face 64 of the three male engageable members 36 generally faces in the opposite second tangential direction D2.

In order to repel the axial clamping force Fa induced primarily through the second proximal face 66 of the three male engageable members 36 generated by the fastening of the clamping screw 28, the three The second lower flank surface 56 of the engagement member 32 may be formed with a support surface that forms an angle between the longitudinal axis A1 and between 35 ° and 75 °.

In a second preferred embodiment of the tool coupling 120, as shown in FIGS. 8 to 11, torque transmission between the first and second components 22, 24 and through the first proximal surface 64. The repulsive force of the first upper flank surface 50 against the induced tangential cutting force Ft is such that the first upper flank surface extends along a radial line R1 that intersects the longitudinal axis A1, respectively. It can be improved by arranging the first upper flank surface 50. As best shown in FIG. 8, the first plane P1 is offset from the corresponding radial line R1 and parallel to the line, so as to be parallel to the longitudinal axis A1, but including it. It is not.

While the invention has been particularly described to some extent, it should be understood that various alternatives and modifications can be made without departing from the spirit or scope of the invention as the claims hereinafter described.

Claims (19)

A first component 22, a second component 24, and a clamping member 26 for clamping the first and second components 22, 24 together,
The first part 22 has a mounting surface 30 provided with a longitudinal axis A1 and at least three female engagement members 32,
The second component 24 has a mounting surface 34 having at least three male engageable members 36 that mate with the at least three female engagement members 32,
Each of the at least three female engagement members 32 has a first plane P1 and at least two sets of sides 46, 48, the at least two sets of sides 46, 48 having each of the female engagement members Located on at least the share 58 of at least 32, the share 58 exhibiting mirror symmetry about each first plane P1,
Each of the at least two set sides 46, 48 has two opposing flank surfaces 50, 52; 54, 56 separated by the respective first planes P1,
Only one of the two flanks 50, 52; 54, 56 of each of the at least two set sides 46, 48 has a corresponding proximal face 64, 66 at each of the at least three male engageable members 36. Contacting and clamping,
Tool couplings (20, 120). The method of claim 1,
The mounting surface 30 is generally planar,
The first plane P1 is perpendicular to the mounting surface 30,
Tool couplings (20, 120). 3. The tool coupling (20, 120) according to claim 2, wherein each share (58) extends in a direction substantially parallel to a planar mounting surface (30). The method of claim 1,
The two flanks 50, 52; 54, 56 of each of the at least two set sides 46, 48 are mirror points symmetric about each of the first planes P1, S1, S2; S3, S4. And reference lines L1, L2; L3, and L4 perpendicular to the surface points S1, S2; S3, and S4 form the same acute engagement angles α1 and α2 equal to each of the first planes P1. ,
The engagement angles α1, α2 associated with the at least two set sides 46, 48 are different,
Tool couplings (20, 120). 2. The tool coupling of claim 1, wherein two flank surfaces 50, 52; 54, 56 of each of the at least two set sides 46, 48 exhibit mirror symmetry about each of the first planes P1. (20). The tool coupling (20) according to claim 1, wherein the mounting surface (30) exhibits mirror symmetry about a first plane (P1) of at least three female engagement members (32). The tool coupling (10) according to claim 1, wherein the mounting surface (30) has exactly three female engagement members (32), and the mounting surface (34) has exactly three male engagement members (36). 20, 120). The method of claim 1,
The first component 22 has a generally cylindrical shape with a continuous peripheral surface 38 adjacent the mounting surface 30,
Two flank surfaces 50, 52; 54, 56 of each of the at least two set sides 46, 48 intersect the peripheral surface 38,
Tool couplings (20, 120). The tool coupling (20, 120) of claim 1, wherein the mounting surface (30) exhibits rotational symmetry about a longitudinal axis (A1). The tool coupling of claim 1, wherein the first plane P1 of the at least three female engagement members 32 is parallel to the longitudinal axis A1 but does not include the longitudinal axis A1. (120). The tool coupling (20) of claim 1, wherein the first plane (P1) of the at least three female engagement members (32) comprises the longitudinal axis (A1) while facing radially. The method of claim 1,
The clamping contact between only one of the two flanks 50, 52; 54, 56 of each of the at least two set sides 46, 48 and the corresponding proximal face 64, 66 is such that the at least three female engagement members ( 32) occurs in each contact zone 72, 74,
A second plane P2 perpendicular to the first plane P1 intersects each contact region 72, 74 of each female engagement member 32,
Tool coupling (20). The tool coupling (20, 120) of claim 4, wherein each of the at least three female engagement members (32) has exactly two sets of sides (46, 48). The method of claim 13,
Each of the at least three female engagement members 32 has a first set of sides 46 adjacent to the mounting surface 30 and a second set of sides 48 spaced apart from the mounting surface 30, and Reference lines L1 and L2 perpendicular to the surface points S1 and S2 of the two flank surfaces 50 and 52 of the first set side surface 46 are each of the first plane P1 and the first engagement angle α1. And reference lines (L3, L4) perpendicular to the surface points (S3, S4) of the two flanks (54, 56) of the second set side surface (48) are each of the first plane (P1) and the second. Form a tooth angle α2,
The first engagement angle α1 is greater than the second engagement angle α2,
Tool couplings (20, 120). 15. The method of claim 14,
The first set of side surfaces 46 have first upper and second upper flank surfaces 50, 52, and the second set of side surfaces 48 have first lower and second lower flank surfaces 54, 56. ),
Only one of the first upper and second upper flanks 50, 52 is in clamping contact with the first adjacent surface 64, and only one of the first lower and second lower flanks 54, 56 is made of 2 is in clamping contact with the adjacent surface 66,
Only one of the first upper and second upper flanks 50, 52 and only one of the first lower and second lower flanks 54, 56 are separated by the respective first planes P1. ,
Tool couplings (20, 120). 16. The method of claim 15,
The first upper flank surface 50 is in clamping contact with the first adjacent surface 64,
The first upper flank surface 50 extends along a radial line R1 that intersects the longitudinal axis A1,
Tool coupling 120. 16. The method of claim 15,
The second component 24 includes a through bore 68 extending between at least one cutting portion 40 and an end surface 60 opposite the mounted surface 34,
The clamping member 26 in the form of a clamping screw 28 passes through the through bore 68 and meshes with the threaded bore 70 at the mounting surface 30 of the first part 22,
Tool couplings (20, 120). 18. The tool coupling (20, 120) of claim 17, wherein the through bore (68) and the threaded bore (70) are coaxial. 18. The method of claim 17,
The at least one cutting portion 40 comprises a cutting edge 42 and an associated rake face 44,
With respect to the central axis A2 coaxial with the through bore 68, the rake face 44 of the at least one cutting portion 40 is generally directed in the first tangential direction D1 and the at least three male teeth. The first proximal face 64 of the resilient member 36 generally faces in the opposite second tangential direction D2,
Tool couplings (20, 120).

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